Proteomics analysis identifies IRSp53 and Fascin as critical for PRV egress and direct

Pseudorabies virus (PRV) has been widely used as a live transsynaptic tracer for mapping neuronal circuits. Systematically identifying mature PRV virion proteomes and defining copurified host proteins are necessary to fully understand the detailed mechanism underlying PRV transmission processes. Here, we developed a PRV virion purification strategy based on sorting with flow cytometry and characterized the mature extracellular and intracellular PRV virion proteomes using liquid chromatography coupled with tandem mass spectrometry. In addition to viral proteins, a large number of host proteins were also identified, including proteins related to actin cytoskeletal dynamics and membrane protrusion. How many of these host proteins are true virion components are unknown and the majority of these may not be. Through functional analysis, we found that IRSp53 and fascin were critical for the egress